A. 20α
B. 200α
C. 2000α
D. 20000α

Correct Answer: Option A

A. 20α

Explanation

L2−L112−θ1)=α×0.5×40=20α

SEE ALSO  If a wire 30cm long is extended to 30.5cm by a force of 300N. Find the strain energy of wire?

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